C reference

From cppreference.com

C89, C95, C99, C11, C17, C23
Language Basic concepts Keywords Preprocessor Expressions Declaration Initialization Functions Statements Headers	Type support Program utilities Variadic functions Diagnostics library Dynamic memory management Strings library Null-terminated strings: byte − multibyte − wide Algorithms library	Numerics library Common mathematical functions Floating-point environment (C99) Pseudo-random number generation Complex number arithmetic (C99) Type-generic math (C99) Date and time library Localization library Input/output library Concurrency support library (C11)
Technical specifications Dynamic memory extensions (dynamic memory TR) Floating-point extensions, Part 1 (FP Ext 1 TS) Floating-point extensions, Part 4 (FP Ext 4 TS)
External Links − Non-ANSI/ISO Libraries − Index − Symbol Index